This is a perfect example of the difference between ultralight and unprepared. All they needed was minimal shelter and a jacket to survive 24 hrs. Ultralight gear makes this so easy. Here's one simple solution of many:
Cuben fiber tarp Shelter 4 oz
Nanopuff Primaloft pullover 9 oz
Waterproof breathable jacket 6 oz
19 ounces total, easily fits in a hip pack. Like carrying a 16 oz water bottle.
